It's hard for me to be objective about this film, as it is adapted from my favorite novel--which I've read eight or nine times. Also, I waited so long to see it that it may have been inevitable that I would ultimately be disappointed. Ironically, I first heard about the film some years before I read the book, and it was only after I read the book that I made the connection between it and the description my brother had once given me. It would be about 20 years (no kidding!) before I finally saw the film myself. I've now seen it twice and mostly hated it both times.
Kingsley Amis's LUCKY JIM was obligatory reading among history students when I was in grad school 30 years ago. The story about an unhappy history instructor in a crummy British provincial university expressed a lot of the angst that we felt as grad students, and it was funnier than heck as well. I loved the book then, and still love all these years later. Why, then, was the film such a disappointment? Mainly because the script muted much of the savageness of Amis's humor, and because it tacked on an idiotic chase scene at the end that has nothing whatever to do with the original story--or even with what goes before it in the film. (Even Ian Carmichael--who played Jim--hated that ending. He told me that the people making the film didn't seem to have any idea of what they were doing--and it shows.)
The producers also added a very unsatisfactory and irrelevant academic procession in them middle of the film--evidently for the sole purpose of making Carmichael look like a klutz by having him tripping over flowerpots and dropping things in the middle of the solemn affair.
Nevertheless, the film does have its virtues, chief among them is excellent casting. Ian Carmichael was born to play Jim. Terry-Thomas was properly unctuous as Bertrand; Hugh Griffith certainly looked the part as Professor Neddy; Maureen Connell looked like I imagined the neurotic Margaret Peel; and Sharon Acker made a fine-looking Christine Callaghan.